Just recently fired up my NAS540 which have sat in its box since I bought it back in 2014. I am at firmware 5.00 and find that 5.20 is the latest. This goes automatically in the menu and as I click "Apply update", the file downloads and the update process starts.

After reaching about 55% however it stops, and when upgrading from the desktop menu I get a message saying: "Last FW Upgrade Failed. Please contact ZyXEL for more information. Error Code: -12".

When I try upgrade from within the settings menu the same thing happens, though the message here reads: "Invalid firmware file".

I've tried restarting and retrying over and over from different computers and different browsers and whatnot. All with the same result. Any help? Ideas?

I don't think you can go from fw 5.00 to 5.20 directly. In firmware 5.10 the memory page size changed from 64kB to 4kB, which seems to have impact on some details of the filesystems. Don't know why.For that reason the 5.10 update contains some scripts to cover that. So I think you have to install 5.10 first, and then 5.20.

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